First, no Senate candidate from a party other than the state presidential winner won. This was the lowest ticket splitting election ever in result. Usually at least some Senate candidates are able to differentiate themselves enough from the presidential result to win. For example, Heidi Heitkamp from North Dakota won in 2012, even as Romney won the state.
Second, historically it was the Democrats who benefited most from ticket splitting. Conservative Southern Democrats won seats by taking separate positions from the national party. However, only a couple conservative/moderate Democrats remain. More moderate Republicans have had some success in resisting polarization but notice that didn't help any Senate candidates like Mark Kirk and Kelly Ayotte.
Third, some of the criticisms of Donald Trump were aimed at college educated Republicans. He does especially badly with that group and especially well with people with no college. It's also worth noting that college educated Republicans did not like Hillary Clinton either. Thus, it made sense for them to vote against Trump and for a Republican Representative to restrain Clinton. In some areas (mostly suburbs), there are far more college educated Republicans to gain than people with no college to lose.
Fourth, the source is talking about the Minnesota state legislature, not the national legislature. It doesn't really give enough information to say if this is because of reasons local to specific races of Minnesota or to more fundamental reasons like regional demographics. I'm not sure how many federal House Republicans won in districts that Trump lost.
Note that Clinton's voters were concentrated in cities. She won them overwhelmingly while Trump had smaller margins in rural and suburban districts. Since they had similar numbers of votes, math suggests that Trump should have won more districts than Clinton.
The Cook Political Report tracks all Congressional districts and their net presidential vote. They haven't released the 2016 results as I type this, but they should appear on that page when available. The 2014 results are there and show how things were previously. In particular, they show what districts Barack Obama won in 2012 where Republicans won in 2014.